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I was collecting experimental data on the Briggs Rauscher reaction and realized that the period of the amber oscillations initially decreased and then started to increase. While I understand the amber colour is caused due to the presence of molecular iodine and is present during the radical process and that the radical process is autocatalytic, I do not get why the period of these oscillations decreases. The period of the deep blue oscillations increases as time progresses which makes sense since the consumption of malonic acid results in the speed of the non-radical process increasing.

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